Add iPhone target with shared data layer and persistent cache

Two-target restructure: shared sources (models, services, settings,
extensions, team logos) move into Shared/, consumed by both the
existing macOS menu bar app and a new iOS app. MainService no longer
imports AppKit — platform code attaches via a MainServiceObserver
protocol (MacObserverAdapter wires back to MenuManager / StatusItemManager
/ NotificationManager).

iPhone app is a single SwiftUI page mirroring the macOS menu (playoff
round + yesterday/today/tomorrow), with a gear-icon settings sheet
(display option + IndieAbout for license/changelog). Persistent JSON
snapshot in Application Support paints last-known data on cold launch;
"Updated …" header escalates secondary → orange (>5min) → red (>30min)
so staleness is visually unmistakable. Foreground polling, scenePhase
refresh, and pull-to-refresh; no notifications on iOS in v1.

Shared/Extensions/TimeInterval+humanReadableTime.swift

@@ -0,0 +1,36 @@
+//
+// TimeInterval+humanReadableTime.swift
+// IceGlass
+//
+// Copyright 2026 Rouslan Zenetl. All Rights Reserved.
+//
+
+import Foundation
+
+extension TimeInterval {
+    static func humanReadableTime(from timeInterval: TimeInterval) -> String {
+        let seconds = Int(timeInterval)
+
+        let hours = seconds / 3600
+        let minutes = (seconds % 3600) / 60
+        let remainingSeconds = seconds % 60
+
+        var components: [String] = []
+
+        if hours > 0 {
+            components.append("\(hours) \(hours == 1 ? "hour" : "hours")")
+        }
+        if minutes > 0 {
+            components.append("\(minutes) \(minutes == 1 ? "minute" : "minutes")")
+        }
+        if remainingSeconds > 0 || components.isEmpty {
+            components.append("\(remainingSeconds) \(remainingSeconds == 1 ? "second" : "seconds")")
+        }
+
+        return components.joined(separator: " ")
+    }
+
+    func humanReadableTime() -> String {
+        return TimeInterval.humanReadableTime(from: self)
+    }
+}